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Arduino - DHT22 AM2302 example code

This is very simple project that will Arduino read data from DHT22 to show humidity and temperature.

As specification datasheet, DHT22 use lowe power 3-5VDC, 2.5mA max (when data sending). Measuring range is 0-100%RH (accuracy ±2-5%), -40 to 80°C (accuracy ±0.5°C). However, it is quiet slow response. It needs "delay" time at each time getting data so called "sampling time" in 2 seconds.